People tend to check in during these times:
Good for buggies. Hot chocolate isn't great
Check out the new Xmas cups!!
Good WiFi signal - switches on automatically every time - and it's free!
Great coffee - free WiFi and even a small Meeting Room where you can plug in your laptop and work in 'relative' peace - within a few feet of the coffee queue
You really don't need a large coffee a medium is fine.